How to Find a Builder You Can Trust (UK 2026)

Last updated: 15 July 2026 · By Mossy Tariq, Founder — Property Blueprint Co.

How to find a builder is really a question about how to verify one, because in the UK there is no licence to verify against. Anyone can print a card that says "builder" and start quoting tomorrow. Gas work is regulated, electrical work is regulated, but the person coordinating your entire extension is not, and nobody official is going to vet them for you.

That is why finding a builder in the UK is not a matter of trusting a badge. It is a matter of assembling a verification trail from public records and independent schemes before money changes hands — a checkable sequence that separates a firm you can hold to account from one that disappears when the snagging list appears.

The UK does not license builders. The register you need does not exist, so you build it yourself, from public records.

What follows is that verification stack in order — accreditation, Companies House, insurance and trade registrations, references, red flags, and the contract and dispute routes — so that by the time you sign, the builder is a known quantity rather than a hopeful one.

Why is finding a builder in the UK entirely your job

Because no single body licenses general builders in England, Wales, Scotland, or Northern Ireland. A plumber touching gas must be on the Gas Safe Register by law; an electrician self-certifying their work must belong to a Part P competent person scheme. But the builder who knocks down your wall, manages those trades, and takes your money needs no licence to do any of it. The regulation sits on the specialist tasks, not on the person running the project.

TrustMark is the closest thing to a national standard — the only government-endorsed quality scheme for work in and around the home, overseen by the Department for Business and Trade. But it is a voluntary quality mark, not a licence: a builder is not breaking the law by not holding it. A licence is something a builder must have to trade; a quality mark is something a good builder chooses to earn. In the UK, every builder is choosing, and your job is to check what they chose. Before that vetting even begins, it is worth deciding whether you need a project manager or main contractor at all — on a contained single room, you often do not.

How to find a builder you can actually verify

Verification is not one check but a stack of them, each catching what the last one misses. A builder who passes all six is not guaranteed perfect — but one who fails any of them has told you something before you have paid a penny. Run these in order:

1. Accreditation. Confirm Federation of Master Builders membership or TrustMark registration on the scheme's own register, not from a logo on a van.
2. Companies House. Look up the limited company for its age, its filing history, and the director's record with other companies.
3. Insurance. Get written proof of current public liability cover, and employer's liability cover if the firm has staff, with the policy dates and limits visible.
4. Trade registrations. Confirm the registrations the job needs — Gas Safe for gas, a Part P scheme for electrics, FENSA or CERTASS for windows — are held by whoever does that work.
5. References. Visit a completed job, not a photo of one, and ask that homeowner how the snagging list and the variations were actually handled.
6. Contract. Establish that the builder will work to a written contract and a proper quote, not a verbal estimate, before any deposit is discussed.

The accreditation layer is where most homeowners stop, and it is the weakest place to stop. FMB membership is meaningful because it is earned: the FMB vets a builder's trading and credit history, checks proof of public liability insurance, runs director checks, and inspects completed work before the firm can join. But it tells you nothing about the company's finances today, which is what the next check is for.

How do you check a builder on Companies House

Companies House is the free public register of every limited company in the UK, and the single most useful check most homeowners never run. Search the company name and you see when it was incorporated, its filing history, its accounts, and — the part that matters most — the director's record with every other company they have run. A firm trading for three months under a director whose last two companies were dissolved owing money is not a firm you found; it is a pattern you missed.

That pattern has a name: phoenixing. A director runs up debts in one company, lets it be struck off, and starts a fresh company the next week — same person, same van, clean-looking new name, every previous customer's complaint left behind in the dissolved shell. The filing history shows it plainly: a "first Gazette notice for compulsory strike-off" against a previous company, then a new incorporation, is the phoenix rising. Companies House does not check the accuracy of what is filed, as the register itself states. It is a records trail, not a guarantee — but a records trail is exactly what a rogue builder cannot fake retrospectively.

What insurance and trade registrations must a builder hold

Two kinds of cover matter, and one of them is the law. Public liability insurance protects you if the builder damages your property or a neighbour's, or injures a passer-by — not legally compulsory, but a builder without it is asking you to carry their risk. Employer's liability insurance is different: any firm with employees must hold it under the Employers' Liability (Compulsory Insurance) Act 1969, and GOV.UK puts the statutory minimum at £5 million of cover from an authorised insurer — the floor set by the 1998 Regulations. Ask for both certificates, check the dates are current and the limits adequate, and confirm the trade description on the policy matches the work.

The specialist trades a builder coordinates carry their own mandatory registrations, and these are non-negotiable because they are enforced by law or by Building Regulations:

1. Gas — the Gas Safe Register. Gas work is a criminal offence unless carried out by a Gas Safe registered engineer, under the Gas Safety (Installation and Use) Regulations 1998. The engineer carries an ID card showing what they are qualified to do; ask to see it.
2. Electrics — a Part P competent person scheme. Notifiable electrical work must be done by a registered scheme member — NICEIC, NAPIT, and others — who can self-certify compliance, or else notified separately to building control.
3. Windows and doors — FENSA or CERTASS. Replacement windows and external doors must comply with Building Regulations; a FENSA or CERTASS registered installer self-certifies that and issues the certificate a buyer's solicitor will later want.
4. The guarantee — insurance-backed. A builder's own guarantee is worthless if the builder is gone, so a genuine warranty is insurance-backed by a third party; TrustMark-registered firms are expected to carry a minimum two-year financial protection policy.

The government maintains the authoritative list of competent person schemes, and the Gas Safe Register lets you verify an engineer by name or number. Both take minutes.

How do you check references and spot the red flags

A reference is only worth having if you visit it. Photographs prove a builder owns a camera. A site visit to a completed job — ideally one a year or two old, so any defects have had time to surface — lets you ask the questions that matter: was the final bill close to the quote, how were variations priced and agreed when the scope changed, and how was the snagging list handled at the end.

This is also where you insist on a quote rather than an estimate. A quote is a fixed price for a defined scope; an estimate is a guess the builder is free to exceed. A tight scope of works is what makes competing quotes comparable and closes the gap a vague brief leaves open. The red flags cluster around the paperwork the builder would rather not create:

On deposits, the UK sets no statutory cap, which makes the norm your only guide: a modest deposit to secure a start date, then stage payments tied to visible milestones — ideally building control inspection points — and around five per cent retention held back until the defects are cleared. Paying the deposit by credit card adds statutory protection a bank transfer does not. A builder asking for thirty per cent upfront, in cash, before the skip has arrived, is asking you to fund their cash flow and surrender your leverage at the same time.

What contract and dispute routes protect you

A signed quote is technically a contract, but a thin one. A proper written contract governs the delays, the variations, the defects period, and the payment schedule — everything a quote is silent on. The named standard for domestic work is the JCT Building Contract for a Home Owner/Occupier, a plain-language template designed for projects where you engage the builder directly without an architect; the FMB's own domestic building contract does the same job. Many small builders will not have used one. Insist anyway — walking through the document together surfaces the disagreements before they become invoices.

If it still goes wrong, the routes are real and mostly free. Citizens Advice is the front door to the consumer service that feeds Trading Standards, the council department that pursues traders who break the law. Alternative dispute resolution — the FMB is certified by the Chartered Trading Standards Institute to provide it — resolves many disputes without court. The protection you want is the one you set up before signing, not the one you go looking for after.

That whole sequence — verify, insure, reference, contract — is phase four of the operational system a prepared homeowner runs, and it sits inside The 12-Phase System, Property Blueprint Co.'s framework from first quote to final sign-off. Finding a builder is not a leap of faith in a country that refuses to license them. It is a checklist, run in order, before the money moves. The Renovation Blueprint systems carry that checklist room by room, from The Kitchen Renovation Blueprint to The Full Home Renovation Blueprint.

If the cost baseline is the right first step, use the free Renovation Cost Calculator — a trade-by-trade estimate for your specific project, in under 5 minutes, before any builder has quoted.

Frequently asked questions

Do UK builders need a licence?

No. There is no licence to be a general builder in England, Wales, Scotland, or Northern Ireland — anyone can trade as one. Only specific tasks are regulated: gas work requires Gas Safe registration by law, and notifiable electrical work requires a Part P competent person scheme. The Federation of Master Builders is campaigning to introduce licensing, which is the clearest sign it does not yet exist. Verifying a builder is the homeowner's job.

How do I check if a builder is legitimate in the UK?

Run a stack of checks: confirm any FMB membership or TrustMark registration on the scheme's own register, look up the limited company on Companies House for its age and the director's record, get written proof of current public liability and employer's liability insurance, confirm the Gas Safe, Part P, and FENSA or CERTASS registrations the job needs, and visit a completed job to ask how variations and snagging were handled.

What is a phoenix builder and how do I spot one?

A phoenix builder runs up debts in one company, lets it be struck off, and reopens under a new name — the same person with a clean-looking slate. You spot it on Companies House: a very new company whose director previously ran companies that were dissolved or compulsorily struck off. Companies House does not verify what is filed, but the filing history reveals the pattern.

What insurance should a UK builder have?

Public liability insurance, which covers damage to your property or injury to others, and employer's liability insurance, which is a legal requirement for any firm with employees under the Employers' Liability (Compulsory Insurance) Act 1969 and must provide at least £5 million of cover. Ask for both certificates, check the dates are current, and look for an insurance-backed guarantee so the warranty survives if the builder does not.

Should I pay a builder a deposit upfront?

A modest deposit to secure a start date is normal, but the UK sets no legal cap, so the safeguard is structure rather than size. Tie stage payments to visible milestones such as building control inspections, hold around five per cent retention until defects are cleared, and pay the deposit by credit card for added protection. A demand for a large cash deposit before work starts is a red flag.

What contract should I use with a builder?

A written contract, not just a signed quote. The named standard for domestic projects is the JCT Building Contract for a Home Owner/Occupier, a plain-language template covering payments, variations, defects, and disputes; the FMB domestic building contract is an equivalent. If a builder refuses to work to any written contract, treat that as the answer to whether to hire them.